The combination is the heart of chess.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown75"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A00"]
[FEN "4r1k1/1p4p1/p2Q3p/3P4/2P2p2/7P/PP6/4r1NK b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f3 2. Qg3 Rf1 3. Kh2 Re2+ { This move is best, but any reasonable move
wins. f2 even a5. } 4. Nxe2 fxe2 5. d6 e1=Q 6. Qxe1 Rxe1 { Black wins with a
large material advantage. } 0-1